Reverse what I said above.
1. Plumb the actuator first then see if this runs 0.4bar. This will confirm if boost control is active when you see your fault condition.
2. Then adjust the actuator and do it again and record the boost level.
Revert back to normal boost plumbing, then 'IF' the problem occurs again record the level to confirm if it is the same recorded at point 2 above.
If it is then the ECU is potentially detecting something and switching boost control off.
On the MY93-96 I did experience on a number of occasions MAF failure that exhibited limited boost, but not CEL. Cleaning the MAF in some cases cured it, in others only another MAF cured it.
The MY97-98 runs a similar MAF design, although I am not sue if the ECU applies the same control/fault logic. But it could well do.......
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